Method of making cyanogen bromids.



il siiiso e'ioe'ifss ATENT side's;

GARL GQEPNER AND WILHlllLM VVITTER, OF HAMBURG, GERMANY.

M ETHQ 43F it"lff ildlNG CYANOGEN BROMEDS.

SE'EGXEICATIGN forming past; of Letters Patent Ho. 666,135,:1eted January 15, 1901. Application filed September 15, 1900. Serial No. 80,138. 1% specimens.)

f0 aJZ whom it may concern:

Be it known that we, CARL GOEPNER, of

, @enulsti'assc 4:6 48, and WILEELM WITTER,

of 36 Holie' Bleicheu, Hamburg, in the Rim pins of Germany, heveinvented eceriein new essary to odd alkali oyenid and acid, since the mixture contains the lJi-omid and bromete iu the pioper molecular proportion.

The formation of the cyanogen bromid is expressed by the following equation:

ma so cNesrmoN-ismo. If there is added to the mixture en oxidizg agent, the sodium bromid, which remains g1 olianged, is also decomposed'with formeof cyanogen bromid. Suitable oxidants oli efior instance, nitric acid, ohloretes, brometes, mangenetes, and the like. Supposing {"Iiibl'ld acid be used, the change may be expressed by the following equation:

instead of the bromide end brome-tes of the alkali metals those of the alkaline earth metals and instead of alkali cyeuid hydrocyanlo sold may be used.

By mixing the lii'omid end bromete solution with the cyeuid solution and runningthe mixture into not too dilute hot sulfuric acid the eyeuogeu bromid may be caused to distil over and may be condensed in another vessel.

The. process described above may be car ried out both at high end at low temperatures and lies the advautsge that i it may be obtained pure cyanogen bro-mid or a dilute solution thereof, such as is used in the oyanid process of gold extraction. in this manner solutions from. which the gold has been thrown out and whi'oii contain it oei'teiu proportion of hromid produced from the cyanogen bro mid during the extreotiog process may be regenerated. in order to miss the contents of such epeut solution in. cyeuogeu bromid to the necessary degree it is only necessary to add the proper proportion of laminate, cyanid, and acid. Example 1. Four hundred and eighty parts, by weight, of loromio are dis: elved in a solution containing two hundred and forty parts of caustic sods, with s eoiuti mid and laroiueti real and fortyseveu pests of r t V Dilute solfuiio eoio; eddedto this solution until rather more time two hundred and ninety-four grants of feel sulfuric acid has been introduced. The liquid time obtained contains cyanogen bromid according to the equations v fiBr-HlNeOH=5NeBr+1leBrO +BH 0 l T, SNeB: ll'eBi O +i l-.aGN-l-ol1 SZKSQHBTNa+3BPON+3HQO and is ready fox" application to gold extractiou 02 other purpose. i

Example 2", Two hundred and six posts, by

weight, of eodium brouiid one hundred and fifty-oue pests of sodium lirouia-te and oneliundred end forty-seven parts of sodium 'cyenid are dissolved in Wetev, To this solutiou are added two i; d ("1d uiuety' foul ports of sulfuric so on liquid coutoiuiug o euogemlaromu sioed shown by the following equation;

Example 3. A solution containing the bromid, lei-emote, sud cyouid of sodium pre pared as described in Example 2, is run slowly fifty-percent. strength and connected with e condenser. Cyanogen bromid'begins at once to distil over, and the distillation may be completed by application of heat.

Having thus described the nature of our said invention and the best means We know also mixed;

into e retort containing hot sulfuric acid of i staining cyanogen bromid consisting in first of carrying the same into practical effect, we claim-'- 1'. The method of making a solution conmixing solutions of a bromid, a bromate and a cyanid, and then adding an acid; substantially as described.

2. The method of makinga solution containing cyanogen bromid, consisting in first mixing a solution containing two molecular proportions of a bromid with one containing one molecular proportion of a bromate and one containing three molecular proportions .of a cyanid, and then adding three molecular proportions of sulfuric acid; substantially as described.

3. The method of making cyanogen bromid consisting in first mixing a solution containing two molecular proportions of a bromid with one containing two molecular proportions of a bromate and one containing three molecular proportions of a cyanid and then running the liquid thus obtained into a retort containing hotsulfuric acid, and finally condensing the cyanogen bromid evolved; substantially as described.

In testimony whereof wehave hereunto set our hands in presence of two subscribing witnesses.

.OARL GOEPNER.

WILHELM WI 'I"1ER. Witnesses: v

E. H. L. MUMMENHOFF', O'r'ro W. HELLMRICH. 

